Re: [PATCH] TIG: Fix to reinstate proper operation with no arguments

> Since c7d67ab running "tig" with no options has failed with the
> error "tig: No revisions match the given arguments." This was due
> to a change in how the arguments for the back-end git call was
> being constructed. This change caused the blank field left in
> place of "(encoding_arg)" when it is empty to not overwrite
> "buf" which then caused the value in "buf" to be copied into
> dst_argv twice. The resulting git command failed if there was no
> available revision named "log" as shown in the trace.
>
>  From the TIG_TRACE log:
> git log log --no-color --pretty=raw --parents --parents --
> fatal: bad revision 'log'
>
> This fix works by teaching tig that when it is supplied with a
> blank field in the source argument buffer that it should skip
> over that field and continue instead of copying the previous
> field value into the destination buffer a second time.
>
> github issue # 167
>
> Signed-off-by: Drew Northup<n1xim.email@gmail.com>
> ---
>
> This should apply cleanly to the tig public master whether the
> mkstemps() patch I wrote has been applied or not.
>
>   tig.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/tig.c b/tig.c
> index ba9ba98..1016cfe 100644
> --- a/tig.c
> +++ b/tig.c
> @@ -3105,10 +3105,11 @@ static bool
>   format_append_arg(struct format_context *format, const char ***dst_argv, const char *arg)
>   {
>   	format->bufpos = 0;
> +	int len = 0;
>
>   	while (arg) {
>   		char *next = strstr(arg, "%(");
> -		int len = next ? next - arg : strlen(arg);
> +		len = next ? next - arg : strlen(arg);
>
>   		if (len&&  !string_format_from(format->buf,&format->bufpos, "%.*s", len, arg))
>   			return FALSE;
> @@ -3119,7 +3120,11 @@ format_append_arg(struct format_context *format, const char ***dst_argv, const c
>   		arg = next ? strchr(next, ')') + 1 : NULL;
>   	}
>
> -	return argv_append(dst_argv, format->buf);
> +	if(len){
> +		return argv_append(dst_argv, format->buf);
> +	} else {
> +		return TRUE;
> +	}
>   }
>
>   static bool